Made out of water-resistant 1680D ballistic Nylon, the U30, while small in size, is a lightweight camera backpack that can hold a plethora of equipment. The U30 also features a special compartment to conveniently and safely carry an MP3/CD player with you to listen to your favorite tunes while backpacking: simply put the player in the compartment and run the headphone wire through the special grommet. The U30 can also hold a bottle in a special pull-out compartment placed on the side of the bag.